Eccentric for controlling steam valves on steam engines



W. GREYELL.

ECCENTRLC FOR CONTROLLING STEAM VALVES ,ON STEAM ENGINES.

APPLICATION FILED Jun 26, 1920.

In yen for 'Um'rs WILLIAM GREYELL, or wobnmvinnn, wnsnmeron.

- To all whom itmay concern) Be it known that 1, WILLIAM GnnirELL,

' a citizen of the United Kingdom of Great ful Eccentric for Controlling Steam =V;a1ves on Steam Engines, of which the following is a specification.

My inventionrelates to improvements in the eccentrlc WlllCll controls the steam valve on a steam engine, regulating the admission ofsteam into "the piston chamber and the objects of the improvement are:

1. To conserve and compound steam.'

2. To permit of steam expansion for driving power. Q

3. To .so regulate the admission and cutoff of steam to and from the piston chamber that steam expansion drives the piston from to of its distance.

I attain these objects by the mechanism illustratedvin the accompanying drawing in which: 7 ,7

Fig. l is a diagrammatic view showing the shape of the cam mounted on the driving shaft, which in its revolutions contacts with the wheels mounted in end of the steam valve connecting rod on caller side of the driving shaft. The full lines show the neutral position when the steam valve is closed,

' the dash lines jshowthe position when the valve is emitting steam into the cylinder through the left hand port, and-the dotted lines show the position when the steam valve is emitting steam into the j the righthand port. I

Fig. 2 is an assembly view showing the yoke at the end of the connecting rod holding the rolls or wheels :1 ainst,the cam which is mounted on the d the steam engine, and a cross sectional view of the steam chest and cylinder showing the steam valve in neutraL FiguresS, 4, 5, and 6 are diagrammatic views showing the consecutivepositions1'of the cam and itscontacts with the wheels mounted in the end of 'thefconnecting rod as it opens and closes the steam valve.

Fig. 3 shows the position as the cam opens the left hand port to full width, and Figure 4 shows the position when the cam' has closed the left hand port, showing the distance traveledv by the piston between .the

yli'nder through the piston travels.

Specification of Letters Patent.

' and 24 of the divided connecting rod riving shaft of;

Patented Jan. 3, 192% Appfica'tion lfled July 2e, 1920. Serial at. 398,942.

Figure 5 shows the position asthe cam opens the right hand port to'full width, and Figure 6 shows the position when the cam has closed the right hand port; again showing the distance traveled by the piston while the steam port is open.

Similar numerals refer to similar parts throughout the several views.

Figure 1 shows a diagrammatic wherein 1 is the main driving shaft. 2? is the cam mounted on 1 as it is in neutral position or such position as when'the Steam valve is closed. 3 is the v same cam in the position it is in when it has by contact with the right hand roller 5 driven it into its position 6 thereby pulling the connecting rod 13 andopening the left hand steam port 14 and admitting steam from the steam chest 15 into the piston cylinder 16. At the same time the left hand roller 8 has advanced to the position 9 and as the cam 2 in its revolution contacts with the leftihand roller 8 in its position 9 and drives it to the left and into the view 'p0sition-10- the right hand roller or wheel I The wheels or rollers 55 e and 8 are mounted on axles 19 and 20? respectively and remain constantly in con tact with the camvin its revolutions, a key in the journal box of 5 being indicated by 21 adjusting the relation of the wheels to the cam 2 so as to keep and maintain the contact. Alongside of the cam 2 and mounted upon the drivingshaft l is the box 22 upon which the two parts "153,

\ ride as the rod drives back and forth. I I am aware that prior to my invention eccentrics controlling steam valves and steam slide valves of diverse types have been made. I therefore do not claim such a combination broadly, but I 'do claim A slide valve operating mechanism comprising a drive shaft, a boxing for said- 105, 1 shaft, a pair of arms slidableon the boxing,

a cam carried by and rotatable, with the shaft and a pair ot adjustable rollers in constant engagement with said cam for op crating a connecting rod attached to the said arms to open and close theinlet'and'. exhaustports of a steam chest.

WILLIM cesarean. 

